[Mac] Tweaks to the Wrench menu buttons.

chrome/browser/cocoa/wrench_menu_button_cell.mm

+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "chrome/browser/cocoa/wrench_menu_button_cell.h"
+
+#include "base/scoped_nsobject.h"
+
+@implementation WrenchMenuButtonCell
+
+- (void)drawBezelWithFrame:(NSRect)frame inView:(NSView*)controlView {
+  [NSGraphicsContext saveGraphicsState];
+
+  // Inset the rect to match the appearance of the layout of interface builder.
+  // The bounding rect of buttons is actually larger than the display rect shown
+  // there.
+  frame = NSInsetRect(frame, 0, 1);

[pink (ping after 24hrs), 2010/08/04 19:16:36]

0.0 and 1.0?

+
+  // Stroking the rect gives a weak stroke.  Filling and insetting gives a
+  // strong, un-anti-aliased border.

[pink (ping after 24hrs), 2010/08/04 19:16:36]

Could you get something similar by insetting by a fractional pixel instead? I
never understand quite when you need to do that.

+  [[NSColor colorWithDeviceWhite:0.663 alpha:1.0] set];
+  NSRectFill(frame);
+  frame = NSInsetRect(frame, 1, 1);

[pink (ping after 24hrs), 2010/08/04 19:16:36]

1.0, 1.0?

+
+  NSColor* start = [NSColor whiteColor];
+  NSColor* end = [NSColor colorWithDeviceWhite:0.922 alpha:1.0];
+  if ([self isHighlighted]) {
+    start = [NSColor colorWithDeviceRed:0.396 green:0.641 blue:0.941 alpha:1.0];
+    end = [NSColor selectedMenuItemColor];
+  }
+
+  scoped_nsobject<NSGradient> gradient(
+      [[NSGradient alloc] initWithStartingColor:start
+                                    endingColor:end]);
+  [gradient drawInRect:frame angle:90.0];
+
+  [NSGraphicsContext restoreGraphicsState];
+}
+
+- (NSBackgroundStyle)interiorBackgroundStyle {
+  if ([self isHighlighted])
+    return NSBackgroundStyleDark;
+  return [super interiorBackgroundStyle];
+}
+
+@end